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首页> 外文期刊>Solid state ionics >Polymer matrix-filler interaction mechanism for modified ion transport and glass transition temperature in the polymer electrolyte composites
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Polymer matrix-filler interaction mechanism for modified ion transport and glass transition temperature in the polymer electrolyte composites

机译：聚合物基质-填料相互作用机理改善聚合物电解质复合材料的离子迁移和玻璃化转变温度

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Fourier transform infra-red (FTIR) spectroscopic studies have been carried out to probe, at the microscopic level, the effect of filler concentration on poly ethylene oxide (PEO) based composite polymer electrolytes complexed with sodium salts (NaClO_4 and NaI) dispersed with inorganic fillers, Na_2SiO_3 and SnO_2. The FTIR results correlate very well with macroscopic changes such as glass transition temperature (T _g), electrical conductivity and mechanical properties in the composite polymeric systems due to the dispersion of filler particles. The striking observation of the two maxima feature in electrical conductivity (σ) variation versus filler concentration is satisfactorily explained in terms of variation of T_g and degree of crystallinity of the polymer composites. Although, few such observations have been reported by other earlier workers in some composite systems no explanation is available at the microscopic level. A mechanism at microscopic level from FTIR results involving ion-polymer, ion-ion, ion-filler and polymer-filler interactions has been proposed by us to explain the variations of σ and T_g as a function of filler concentration. The initial increase in free anions due to the interaction of fillers with ether oxygen of PEO and/or ClO_4~- anions followed by ion-pair formation results in the first maxima in the variations of σ vs. filler concentration. The second maxima results from the additional generation of free anions due to weakening of filler-anion interactions followed by the cluster formation on addition of fillers. The improvements in mechanical properties of the composite polymer electrolytes have also been explained on the basis of the proposed mechanism.
机译：已经进行了傅里叶变换红外（FTIR）光谱研究以在微观水平上探究填料浓度对与分散有无机盐的钠盐（NaClO_4和NaI）络合的聚环氧乙烷（PEO）基复合聚合物电解质的影响填充剂Na_2SiO_3和SnO_2。 FTIR结果与宏观变化非常相关，例如由于填料颗粒的分散，复合聚合物体系中的玻璃化转变温度（T_g），电导率和机械性能。关于T_g的变化和聚合物复合物的结晶度，令人满意地解释了电导率（σ）变化相对于填料浓度的两个最大值特征的惊人观察。尽管其他复合材料系统中的其他早期工作人员很少报告这种观察结果，但在微观水平上尚无解释。我们已经提出了FTIR结果的微观水平的机理，涉及离子-聚合物，离子-离子，离子-填料和聚合物-填料的相互作用，以解释σ和T_g作为填料浓度的函数的变化。由于填料与PEO和/或ClO_4-阴离子的醚氧的相互作用而导致的游离阴离子的初始增加，接着形成离子对，导致σ对填料浓度的变化达到第一个最大值。第二个最大值是由于弱化了填料与阴离子之间的相互作用而产生的额外的游离阴离子，随后在加入填料后形成了簇。基于提出的机理还已经解释了复合聚合物电解质的机械性能的改善。

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